n. A vacation on a farm.
2011
Farm vacations — often called "haycations" — give people a break from the bustle of city life, and a chance to pack up the kids and enjoy a down-home night or two out on a farm. Pennsylvania, California and Vermont lead the nation in "haycation" destinations, according to the database at FarmStayUS.com. Pennsylvania even has its own organization for haycations: the Pennsylvania Farm Vacation Association.
2010
It couldn't have been more different than modern-day city life — and that's the point of Feather Down Farm Days, a European-based company whose "haycations" are taking root in the United States.
2008 (earliest)
Call them haycations: The chance to spend a night or two on a working farm or ranch and enjoy the comforts of a country inn - or a complete guest home on the property - while you learn about your hosts' approach to agriculture.
An earlier (April 4, 2007) usage of haycation appears here as the title of a blog post, but for the life of me I can't see the connection between the post title and the post content, so I don't know whether this qualifies as a cite.